Mining machine



March 30', 1926.

E. c. MORGAN MINING MACHINE Filed Oct. 11, 1922 4 Sheets-Sheet -1 March 30 1926.

1,578,544 E. c. MORGAN MINING MACHINE Filed 061;. 11, 1922 4: Sheets-Sheet 2 I Q j7z zxezzzv 23772247242 jyfyaz March 30 1926.

E, c. MORGAN MINING MACHINE Filed Oct. 11, 1922 4 Sheets-Sheet 3 March 30 1926. 1,578,544

E. C. MORGAN MINING MACHINE F iled Oct. 11, 1922 4 Sheets-Sheet 4 Patented Mar. 30, 1926.

UNITED STATES PATENT:

EDMUND c. MORGAN, OF NEW YORK, N. Y.; OL VEEIIGEN E SAID EDMUND o. MORGAN, DECEASED.

MINING MACHINE,

Application. filed October. 11,.1922.2- Serial No. 593327.

To all whom it may concern:

Be it known that. I, E MUND C. MORGAN, a citizen of the- United States, residing, at New York, in thecounty of New York and State of New York, have invented certain new and useful Improvements in Mining Machines of which thefollowing is a specification.

. This invention relates to machines for mining coal and similar material and is a continuation in part of my co-pending application, Serial No. 121,359, filed. September 21-, 1916, granted February 17, 1925, Patent No. 1,526,558 for an: improvement in mining machines.

One of the objects of the present invention is the provision. of a mining machine which shall be of improved construction and inore eflicient in operation than previously known machines.

The invention is'exemplified in the combination and arrangement of parts shown 1n the accompanying drawings and de-.

scribed in the following. specification, and

it ismore particularly pointed: out. in the appended claims.

In theaccompanying d'rawings- Fig- 1: represents a. sectional elevation view of a mining and loading: machine with my invention applied thereto j 'Figs. 2 and. 3' are d'agrammatic' views showing different cross-sectional shapes of mine chambers formed by the mining machine illustrated in Fig. 1-; Y

Fig. 4: is a vertical sectionalview approximately on. the li11e4.l of Fig. 1 with the movable motor in its forward position;

Fig. 5 is a front elevation-0f one of the loop chain core-cutters; I

Fig. 6 is a cross-sectional view of asupportin bar for the chain cutter;

Fig I isatransverse sectional view on the line 7-7 of Fig.5

Fig. 8 isa. fragmentary elevational view showing a supplementary frame in position for changing one of the. chain cutter's on the. plane kerf-c'utter;

Figs. 9 and. 10 are side elevation and top plan views, respectively, of a supplementary chain replacing frame;

Fig. 11 is a sectional view on the line 11- 11ofFig.8

Fig. 12 is. an. elevational view of mechanism for moving a flexible cutter chain onto or off fromthe lcutter.

frame on the limp chaincutter; and i g Fig. 13 is; a sectional planview takemon the line -13, 13. of Fig. '12. 4-. Referring to Fig. 1,, 25 -jde signate's. a1 Slip porting base plate on; which arer mounted the various parts of the mining; machine. Extending upwardly, from opposite sides of the rear portion: otthe: base platet am two hydraulic cylinders 26; for varyingathe elevation of abearing I118mbeT .29itObWfil Gh is pivoted at 30 the side plates 88i-ofrthe mining machine frame 82.. the: combined action-of the jackfifi andthejacket26 the mining machine may-be. adjusted.- vertically in the mine; chamber with theeoutterhead base plate. 32 in a horizontal; plane, .or the cutting mechanism may. betilted: 6'0

various; angles.v For I instance',, in Eigg; the

cutting mechanism istilted toward. the; noof by causing the-jack-Bfito lifti the machine andoperating the jacks 26., so as to lower the rearendof theminirrg maeliine.

Mounted on the box frame 33yaresepanate chain cutters; illustrated at 40. Fig. 1 and 4,.and at e2iniF-ig, 5.. 'lihe eutten ch-s in 40 is carriedionaframe-A-whiclr hasafimward and backward] sliding movement-e. on

the vertical centraliplane. of. theroutten-heafl;

The frame 43 is supportedatits reanendhy a pair of bracket members -%.-W h\iolr-:depend from'a horizontalplate i5.. Thezplatetfi is mounted to slide betweern guideways; 456

formed on the upperinner;portions efithe side- .members'onthe box frame 333 as shown in Figs. 1"and4. Also-supported by depending from the plate 4 5, is aimotor finennected by gears 48 to a cross-shaft which carries a sprocket wheel-'51. ehaizrcutter 40 slid'ese onthe frame and-rpas ses around the; sprocket 5-1 and isthns-dr-ivenhy I the motor 47 which; is -mounte(l;.to-slidii forwardly' and backwardly along: plane in the machine... together chain lO and its supporting frame. p Longitudinal r-ecip rocations of. theronttiing mechanism thus formed is mameam az-ihydraulic motor 55 canried1oma-plate-p ,1

curedby bolts 57 to-theupper pontior i-o the Therpiston.nod- 58 ofx thercylinder 55 connects with; anupwardlyzexmnding lug 59 formed; integrali-witln the upper portion of the sliding-plate45.- ltdssevident that: movement. of the pistonirodzfi'fiiinzthe cylinder 55 ill reciprocate the cutter chain 40 in the-longitudinal direction of the mming machine.

' The cutter chain 42 is carried by a loop shaped cutter frame 60 having an unob strii'ct'ed core-opening extending therethrough and mounted for horizontal pivotal movement about an upright axis atone side of the box frame 33. Thereare in reality *application, Serial No. 121,359.

two of such loop chain'core-cutters mounted for operation in opposite directions toward each other with the plane kerf-cutter pro, vided' for severing the crescent-shaped core sections cut by: the two loop chain core-cutters." However, only one loop cham corecutter. is shownin the accompanying drav ing because the appended claims are directed to the mechanism for renewlng the chain cutters, while the combinations including the jacent the pivotal 1 support 61 and meshes 'a'vvith 'a' rack 65 carried by a plunger 66 fitting mam hydrauliccylinder 67-carried by the plate 56. The reciprocation of the plunger--66 in the cylinder 67' operates the gear -"s'egme'n-t 64 to swing the core-cutter about the upright axis 61 to 'jint'o the coal;

" ;The bracket 62 1 feed said core cutter the shaft 81 of the electric motor The base plate 32, as shownin Fig. 1, is

;the forward edge of. the plate 32 and the minef-wall being operated on. This is desirable in order that there will be no opening left between the plate and the wall of theich'amberthrough which the severed ma 'terial may fall as it is being drawn backwardlytoward loading position. The extension plate 90is provided with" a suitable depression 91 in the upper surface of the.

plate 32; through which it slides, the rear edge of the'depression being beveled in -order that no particles of material may be 'c'aug'ht between the rearedge' of the plate t is provided with a shou'l-' de'r' 68 which .bears upon an arouate-shaped slideway 69 secured to the front portion of he boxframe33, as shown in Fig. 4. This 's'lideway supportsthe bracket 62 and the i'loop'chain core-cutter asthey are swung about theaxis 61.

f The loop chain core-cutter 42, as shown in "Fig. 5, is driven by a sprocket wheel 70 -journaled for rotation on a shaft 71 in the -'bracket 62.- -The shaft 71 is driven by means of gearing in the gear casings 79, 80 con- ,7 'nectedto 50 M "provided'with aslidingextension' plate 90 for the purpose of closing the gap between 90 and the shoulder formed by the depression 91.

In order to move the cuttings formed by the cutter chains rearwardly to a position from which they may be conveyed away, a

conveyor chain 100 having flights 101 is mounted to move over the upper surface ofa portion of the base plate 32 adjacent the emerging runs of the chain cutters. The chain 100 is guided by a shoulder 103 formed on'the base plate 32 and by an overhanging flange 104 formed on the lower surface of the box frame 33. An upwardly extending ridge 105 having its outer edge gradually sloping, 'extends around the outer periphery of the path of movement of the flights 101 to prevent escape of material. as

it is carried by movement of'the'se flights. V

The chain 100 is driven by a sprocket wheel 106 carried on an upright shaft 107 and connected by worm gearing 108 to a motor 109 mounted on the base plate 32. H

As shown in Fig. 1, the cutterhead base plate 32 is cut away at its rear p0rtion,'as

indicated at 110, and through the opening thus formed the material escapes as it is drawn backwardly by the discharging apparatus, The material thus discharged is received in a hopper 111 held by a flange plate 112 to the base plate 25ancl free to rotate thereon about an upright axis. An"

endless conveyer 113 is arranged to carry material from the hopper 111 rearwardlyto a position where it may be discharged into a mine car. A guard plate 114 is provided for engaging the opening between the cutterhead base plate 32 and the upper edge of p the hopper 111. This plate 114 is pivoted in slots 115 in the side plates 88 and normally rests in the position shown in Fig. 1, itbeing held from'further downward pivotal movement by stops or abutments 116. It is evident that the entire guard plate 114 may move upwardly between the side walls 88 when the cutterhead frame is moved to its lowermost position. I From time tootime duringthe operation of a mining machine of this character it is necessary to replace or sharpen the bits of the cutting chains. For this purpose the loopchain core-cutter frame 42 may be swung rearwardly and the chain removed, as illustrated in Fig. 12, and as hereinafter described. It is more difficult to reach the chain cutter 40, however, since it operates to cut a vertical intersecting kerf in advance of the mining machine frame to sever the core sections into two parts for movement along opposite sides of the machine toward the hopper 111. In order that the chain 40 may be removed and ad'uplicate chain substituted having new ,cutting'bits, the device illustrated in Figs. 8 to 11, may be provided. This frame having an upper chain guide and device consists of a ang-e44 a low er'chaim guide 186. Supporting st'an diards l lare' provided for the" frame shown iii-'Fig; 9. These-standard's-"137 may he se-' cured asindicated' at 137' to the upper sur face of the box frame 331 I InFig; 8-the unshadedl links represent the oldchain which isto he removed. from the frame 43 and" the shaded links carried by the guides 135 and 136 represent the chain Which is toreplace the used chain; Hllwo of the links ofthe used chain's-are separated and the ends thus formed areconnect'ed with the ends-of the chain to be substituted; Asiter this-is done the motor 4 is opera-ted. to cause the two chains tointerchange placesafter whichv the old chain is disconnected and'removed andi thefree ends of the new chain connected; thus leaving the new chain in position to continue the'cutting operation. lVhen the interchange completed the supplementary chain: carrler may be removed fronrthe-top of the machine and the mining operations proceeded with as be fore; However; if: desired,- the guide frames 135' and 136' may be left permanently connected' tothe frame 83 and the operating length of the chain cutter doubled so as to" be. guided during operation" along boththe frame 43 and'i the detachable guide fra'm'e'i- As the frame 43 moves forward during'the fiee'ding' operation the upper runalong the guide frame 135 wi ll lengthen, but the lower loop at the rear endof the frame 43. will shorten. proportionately "so that during the forward feedo-f the chain cutter one'portion will be-paying out While theotheri p'ortionis being taken up, thus retainin'g proper tension in the chain; Without permitting it become unduly slack; But even when the double lengtlr of chain is used during operation it may 'he renewed by first substituting a new chain length for a half portion thereof and then substituting another new length for the other half portion: ot the chain; Ellis can: readily be done; because; by comparing Fig.1 8= with Fig: 11' it will Be seen: that the rear end of the guideframe. 135,; 136= extends toa position: near the rear end ofthe frame which is in: convenient position for: the attendant.

- In order that the.- cliain 42:mayfhe readily removed from the guide frame 60 the latter, as shownzin'Figsz 6- and 7 isprovided' with notchesin which the chain" slides, the notch being of such shape that the chain-When lOOSQIlECli may he moved bodily in an out- WZXICl direction. away from the cutter: frame 1 or similar devices";

bar Without removal of any-retaining strips The cutter frame bar 60 is provided with: a notch 146) and a peripheral: flange 141- Which cooperates With the flange 142 and the notch 143 formed in; the links of the cutter" chain 42. It is clear that when the chain is' stretch-ed about the frame 60 the tension on the chain'W-ill gagement with the disc wheel's 1545 preventi itliromi moving: outwgntd-l yr army fromzthe: guide frame"; When it is".

to remove: the cliainiit may, he: suifici'entl'y w-iththe' cutter fiiame'rso that'the chaincan" not. bereinoved laterally 'tl1eretrom, as= i-lQll'ISL- tratedi. i11i='FigS. '5, 61 and 7 Referring" to Figs; 12: and: 13' it Willi be' lseenc that at-tlie top of the frame 62 are securedispaced apart- Lsh'aped; angle bars a 144 for: receiying I the pedestal of? mechanism for support 7 ing two chain reels 14:6 and" 14511 The-reel 14 7' is mounted: on: the journalbearing sleeve 1458' the upper endot the: pedestal 145'. The" sleeve'1et8 is mounted tovrotate on the journal. bearing? 149:an'd connected tow the I sleeve 148- is a'wdiso150"in"positioni to heen 7 gagedby' the dniving'wheel 151 The reel 146} is mountedfon tlie sleere which: in tu'rn -is: m'ounted' p-n the journal bearing 153; The sleeve is connected to the disc 154 in positiontoibeengagedi by the friction Wheel 151i Resilient mechanism is provided for" holding the: friction Wheel 151 in yielding engagement With the sn'iall disc 15141 on! the" sleeve 152 and with" the larger disc 150 Which is SGCIII QCli to the sleeve 148." Pivoted at 1 55 is a' rod 1 56"W1i7li" a nut 1-57' at its upper end, Betwveerrthis nut 157 and an arm 158 is a -s gmi'ng-- T592 1 iary sup'portingframe 16-1. The'other end of the arm 158 carries the friction Wheel 151a The opening 162 inthearm'1 '58' is of such: sizeand shape as to p'ermitrwtree up and down incitementof the friction Wheel; 15 1' which is yieldinglyheld in en:

a. an 1 by means ofthe spring 1'59'; v i A belt 163 is adapted to besecured toth'e hub of the" reel 146 andwou-ndtthereon: This belt 163'is adapted to be connected-fat 16'5tto one ot thedisconnectedfl inks of the chain 42, the otherlend of the disconnected chain being connectedto a new chain. 452' on the reel 14:71 The latter i s also provided Witha; belt 163 having'one end secured to the hub=of the reel and the oth'er end' secured at-1'6a to the chain 42 'Which iswo1urd on thisreel'. I

Upon connecting the. chains in the-manner indicated in Fig. 12 the sprocket Wheel" '70 may be driven' hy" the inotor 82 and the gearing connected to theshaft 71 in such;

a direction as to unwind the. chain from the. reel 147.. Motion will. then be transmitted simultaneously through vthe friction wheel 151-:to the reel 146 to wind the belt 163 thereon and subsequently the old chain is removed from the core-cutter. It should be notedthat while" thereel 147 is rotated in an anti-clockwise direction .to unreel the chain 42 therefrom the motion transmitted bythe Wheel 151-to the reel 146 is such as to-cauS-e the reel 146.t0 be rotated in an antic-clockwise direction to Ewind the old chain thereon." Preferably the gear ratio is suchj asto cause-the reel 146 to take up the chain-asfast as it is paid out by the reel 147.;v Tl1e disc;- wheel 150 is therefore of largerdiameter. than the disc wheel 154.

a As the chain is paid; out from the reel 147 gradually increasing diameter of the convotoo "great because wheneverg'fthere' is any lutions thereon. However, the tension on the old chain being removed or on the new chain being substituted 1 therefor can not become tendency in this direction the friction wheel 1 1 51 willslip on the disc/150 or on the disc 154. by reason of the yielding support for the friction wheel 151 comprising the spring 159. 1

. 'VVhile the new chain is being unreeled from'the reel 147, the lateral extension 165 from the'standard 145 may be relied on to properly guide the chain 42 onto the corecutter frame.

fIt shouldalso be noted that the reels 146" and 147 are detachable from the sleeves 152 and 148, respectively; When the reel 146 has the old chain wound thereon, such chain is disconnected frointhe substituted chain and the ends of the latter connected together tofform the endless traveling loop core-cutter chain. Thereel 146 with the old chain wound thereon may. be removed from the sleeve 152 and sent with the chain in a .very compact form to the repair shop where the cutter bits may be removedand sharpened and then brought back in a very compact form on the reel, as'illustrated at 147 in Figs. 12.

and 18 and placed on the sleeve 148. Not only may the old and new chain lengths be transported in verycompact form, but after the bits are sharpened they may be transported while the sharpened bits are amply protected-until ready tobe placed on'the loopchain core-cutter frame in place of an old chain with dull bits thereon. Prefer ably the framework 145, 161 for supporting Shown in Fig. 1..

the reels is detached from the machine after the chain with sharpened bits has been substituted for a chain cutter whichhas been used for some time. After the framework 145, 161, together with the reel driving mech anism is removed from the machine, the latter may be adjusted to operate in positions adjacent the roof of the mine chamber, as

, lVhen the mining machine is inclined, to

the position shown in Fig. 1, the operation is such as to form a roof having the shape of an arch, as shown at 166, in Fig. 2. Then the mining machine frame 32is held in a horizontal position, however, the roof of the mining chamber will be fiat, as indicated at 1671in Fig. 3. Under some'conditions the arch-shaped roof is more desirable as it forms a better support for the material above the chamber, but where such support is not necessary, the flat roof 167 may be preferred as the material may be more completely removed when this shape of the roof is formed. However, since the loop chain core-cutting mechanism, and the plane kerfcutter are disclosed and claimed in my copending application, Serial No. 121,359, I have herein shown only a suflicient portion of the mining mechanism to illustrate the utility of the mechanism forfacilitating removal of used chain cutters bothof the plane kerf-cutter and of the loop core-cutter.

Obviously those skilled in the art may 7 make various changes in the details and arrangements of parts Without departing from the spirit and scope of my invention as defined by the claims hereto appended and I wish therefore not. to be restricted to the precise construction herein disclosed.

Having thus fully disclosed an embodiment of my invention, what I desire to have secured by Letters Patent of the United States is: r r

1. In a mining machine, the combination with a frame adapted to be attached to the frame of a mining machine having a flexible chain cutter, of superposed gui-deways on said frame for receiving a new chain cutter to be substituted for the chain'cutter on the mining machine, and curved f extensions at the opposite ends 'of said guideways for directing the chain withja reverse bending movement upon itself to facilitate the substitution of a new chain for the chain on the machine. 7

2. In an attachment for mining machines having chain kerf-cutters, the combination with a detachable. frame, of longitudinal V superposed guideways thereon for recelving a chain kerf-c'utter for movement along'said guldeways in opposite directions, and up right curved supplemental guides at the opposite ends of said first-named ,guideways for directing thei h i reversely inopposite i3.

directions of travel.

3. 'In' an. attachment "forimining machines having chain kerf-cu'tters, the combination with "spacedsapart supporting :standards adapted to beaattached to the framework of the machine, o'fuspaced-wapart longitudinal guideways .mounted on said standards ior guiding the chain from said kerf-cutter in opposite directions of travel, and curved guiding extensionsat the opposite ends of said guideways to direct thechainreversely upon itself for travel valternately in opposite directions. I r

' 4. In .a mining machine, the combination of an upright cutterchain frame, and detachable guideunechanism mounted in :upright position for directing a cutter chain 0? to. said frame at the upper :portion there- 0 4 i v 5. In a nuining anachine, the combination with a supporting frame, o'fa cutter-chain frame mounted thereon: in :upright position, and a detachable chain guide mounted on top of said supporting 'framefinpositionxto hold a chain supported thereby so that "the end of said chainwilli'be adj acent the chain 'OnE-saidLir-ame :and in'position 'to be connectedtoi-the.last+namedchain. Y

6. A mining machine comprising'a cutter .chain,za frame con-which-saidchainis.mountedftor sliding movement, a supplementary chain guide mounted in spaced relation to said-.fr' ame,;said guide comprising a pair of .slideways .arranged to .hold .a ;.cha in placed thereon iwithiits endsladja'cent thechain on said icutter chain-frame but spaced therefrom to permit operation of vsaid chain without removing [said guide, SO'ZtlliIt a pair of links on said cutter chain maybe disconnected from one another .and' iCODHBCtQCl to the :end links or the chain ion said supplementary guide,:thus forming ;the1two' chains intoan" endless loop iwhereby said cutter chain-may :heireplaced vby :the chain on said supplementaryiguideiby causing said endless loop to travel about said cutter chain frame and saidsupplementaryguide;-

'Z. An .1attachment :for :machines having a chain kerf-cutter, comprising spaced-apart longitudinal guides -superposed and with the forward end of :the upper .guide .icurved v downwardly, a curved guide extension for the upper :guide and located: at the rearend'thereo'f, andza curved guide extension for the lower .guide and located :at the "forward end thereof.

8. In mining apparatus,thecombination with a frame adapted to be detachably connected to a'mining machinenbove a chain -kerf-cutter therein, "and means on said 'detachable frame for guiding :a substitute chain-cutter downwardly from said frame while simultaneously guiding the "used chain cutter upwardly fromgthe kerf-cutter onto said frame. I

9. vIn mining apparatus, the combination with a supporting :frame, :of zchain :kerf:-

mechanism;

cutter in an upright ;direeti'on:ontoisaid;

"anism "above "the kerf-icutter lfor =either :directing a v.chain-cutteronto ssaid npright with a kerfecutter comprising a nutter-'- frame and-a chain nnitter, of ineans' -f orgdriv ing isaid chain-cutter, 1a istationary v guide frame ifOIi aportion of the cutter chaimand meansforffeeding said kerf-cutteriwhilesaid frame remains "stationaryand while theichain travelsithereon.

10. 1n'miningapparatus,the combination cutter 1.IIIOl1I1i'/Bd ithereon for feeding movement relatively thereto,:loopaextension: guide ing mechanism :for the chain=cutter sand mounted in fixed relation to: said supporting frame, and means for driving the skerfcutter including fe'eding' movement thereof 12. :In a mining imaehine, the combination 'with a chain kerf-icutter comprising an xup- :right cutter-frame and ia1fle'xib1e'chain cutter adapted to be xm'ounted :thereon, and

mechanism .mounte d' in the upright plane ."of the cutter-frame ifor -Lclirecting the vchain'- cuttersframe. a y w a 1n;aimininggmachine theicomloination with aIJkerf-nutter .compri'sing an upright cutter-frame and a flexible -chain+eutter adapted i-ito lbe .mounted Ithereon, and mechcutter-frame or -;directing the chainecutter from said icutterrframe.

.14. In :a mmmgima'chinmithe combination no I 15 while the chain travels along said guiding with asnpporting frameyof a cuttermhain* guide mounted thereon and ;.comprisingia trough curved downwardly-at one end,land an additional cutter-chain @guide ispaced above the. first-namedguide and comprismg ports.

.. 16. In :a :miningma-chine, :the combination with a -mining, machine :comprising a ;plane kerf-cutter: having a cutter-frame and 3a a :trough curved .downwardly at .botheends. 2 1 15, :In:. a :mining machine,-.the:combination w ith spaced-apart supports adaptedf to-v Y connected :to theIframe-V ofz'ai mining-:machine having :-a zflexible chain kerf-cutter therein, and qsuperposed spaced-apart gcutte'r chain -guidesmounted. on said sspacedeapart isupv chain-cutter adapted to be mounted thereon,

of 1 spaced-apart supports adapted to be mounted 'onsaid mining ,machinefsuper- Icutter with newly sharpened bits for conposed spaced-apart guides mounted on said supports in position for giuding a chaincutter onto' and off from'said cutter-frame, said guides being adapted to receive a ,chain nection to a chain-cutter on said cutterframe to form an endless chainextending around the cutter-frame and along said -17; In a mining machine, the combination with an uprightkerf-cutter comprising an upright cutter-frame, and a flexible chaincutter' mountedfthereon, of means for driving said chain-cutter, and detachable mech- 7 anism adapted to beconnected to the mining machine for removing the chain-cutter therefrom, in an upright direction and substituting anotherichain-cutter therefor; f I 18. In a mining machine, the combination 7 with anupright kerf-cutter comprising an upright cutter-frame and a flexible chaincutter thereon, of means for supporting aneother chain-cutter in position to be substituted for the one on'said cutter-frame, and mech anism for removing the chain-cutter on said cutter-frame and, substituting v therefor a chain-cutter on said support, by directing 1 said chains along linesin an upright plane extending through said cuttenframe k. 19. In a mining machine, the combination ,with a pair ofreel carriers, of means for supporting said reel carriers in'position to dizrect chain-cutters-onto andoif from acutterframe, and driving connections between said reel carriers. 2 1 V 20; In an attachment to mining machines,

the combination with a supporting frame adapted to be connected to a chain kerf-cutzteradjacent the cutter-frame thereof, of a pair of, reels mounted on said frame, driving connections between said" reels, and means for winding a cutter chain on onereel while paying out the cutter chain from the other reel; '7

f 21. In a mining machine, the combination with pairiofreels adapted to have wound thereon chaincutters,.ofa pair of reel oaririers adapted to be mounted on a mining machinehaving a chain-cutter in position to wind onto one of said reels, a chaincutter on the other reel adapted to be unwound therefrom to take the place of the chain-cutter taken from the mining machine, and driving connections between said reel, carriers to effect the winding of the chain-cutter otn one reel while the chaincutter on the other reel is being payed out.

22. In a mining machine, the combination with two reels each adapted to have wound thereon a chain-cutter, of means for supporting said reels ona mining machine in spaoedapart relation with their axes parallel, and speed compensating mechanism between said reels so that as a chain-cutter is unwound from one reel onto the other the winding cutter and the other for receiving the chaincutter'onthe mining machine, and yielding driving connections between said reel carriers for operating the reels to wind thereon the chain-cutter from the mining machine and unwind therefrom the substituting chaincutter. V 24. In a mining machine, the combination with a frame adapted to bemounted on a mining machine in predetermnied relation to a vchain-cutter thereon, of a pair of reel carriers mounted on said frame for rotation on parallel spaced-apart axes, driving wheels of diiferentidiameters connectedto said reel carriers, and an additional wheel connected between said first-named wheels to transmit motion from one reel carrier to theother while reels on said reel carriers are being operated to wind up and pay out a chain-cutterc from and vto the mining machine i 1 i 25'. In a mining machine, the combination with a supporting frame adapted to be detachably connected to a mining machine comprising a kerf-cutter having a outter-; frame and a chain-cutter mountedthereon, c of a pair of spaced-apart reel carriers mounted on said supporting frame for rotation on parallel spaced-apart axes, a pair of reels mounted on said reel carriers, and an extra cutter-chain wound on one of said 'reels and adapted to be connected to a disconnected end of the chain-cutter onsaid cutter-frame, a flexible connection connected to the inner end of said extra chain cutter and wound on and connected to the reel on. which" said extra chain-cutter is wound, another flexible connection connected to the other reel and wound thereon and having its free end adapted to be-connected to the other disconnected end of the chaincutter onsaid cutter-frame, means comprising the driving mechanism of the chaincutter of the mining machine for'unreeling the said extra chain-cutter from one ofsaid reels while winding onto the other reel the chain-cutter on said cutter-frame to effect the substitution of the extra chain-cutter for the chain-cutter on said cutter-frame, and yielding driving connections between said reel carriers comprising compensating means for effecting an approximately uniform tension in the chains While being paid out from oneof said reels and Wound onto the other reel.

, 26. In a mining machine,"the combination with a chain kertcutter comprising a cutter-frame and a chain-cutter thereon, of

guidingmechanism for a loop extension of the chain-cutter, means comprising a sprocket for driving said chain-cutter When on said cutter-frame and on said guiding mechanism as a loop extensiotn, and means for supporting said guiding mechanism so that the cutter-chain between the same and said sprocket Will be bent back upon itself.

27. In a mining machine, the combination with a chain kerf-cutter comprising a cutter-frame and a chain-cutter, of means comprising a sprocket for driving said chain-cutter, and guiding mechanism for the chain cutter to form an S-shaped double loop between said sprocket'and the outer end portion of saidcutter-frame.

28. In a mining machine, the combination With a supporting frame, of guiding mechanism mounted thereon in fixed relation thereto, guided along said frame and comprising a cutter-frame and a chain-cutter thereon, and means for operating said kerf-cutting mechanism including feed thereof by moving said cutter-frame relatively to said supporting frame While said chain-cutter travels along said guiding mechanism and While the latter efiects an S-shaped double loop between the outer portion of the cutter-frame and said operating means.

In testimony whereof I have signed my name to this specification on 'this'7th day of October, A. D. 1922.

EDMUND O. MORGAN.

chain kerf-cutting mechanism. 

